View Compilation Error

0_0_19217546_30963.cpp: In function 'void Solve()':
0_0_19217546_30963.cpp:14:32: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d", &n, &m))
                                ^
0_0_19217546_30963.cpp:33:46: error: 'printf' was not declared in this scope
             printf("%d / %d\n", a[i]/t, sum/t);
                                              ^